Model K711/K711A/K711L
Resistive Load Bank
10 to 1000 KW
Economical – Uses Engine Air for
Cooling
Reduces “Wet-Stacking” Problems
Provides Load for Routine
Generator Testing
Corrosion Resistant Aluminized
Steel Frame
The Avtron Model K711 Load Banks are intended for
use as a supplemental load for lightly loaded engine gen sets.
The K711/K711A/K711L Load Banks
are designed for duct or radiator
mounting and are available in a
variety of frame dimensions. The
load banks are permanently mounted
to the front of the engine generator
and sized to match the radiator or
exhaust duct opening. The K711 load
banks utilize the engine cooling air
rather than an internal cooling fan
found on conventional load banks.
The primary cause of premature
diesel engine failure is “wet-stack­
ing” which is literally “wet” unburned fuel accumulating in the
engine “stack”, due to under-loading
of the generator. Diesel engines that
are lightly loaded or allowed to idle
for long periods never reach their
recommended full operating temperature. Over time, this unburned
fuel coats the combustion chamber
and pistons with a thick coating of
tar and carbon build-up, reducing
efficiency and life span of the engine considerably. A supplemental
radiator load bank helps to “burnoff” these harmful carbon deposits,
greatly increasing engine life.
These units are offered in 208, 240,
480, or 600 volt versions (at 60 Hz) or
380, 400, or 416 volt versions (at 50
Hz). Load rating varies and typically
ranges between 10 and 1000 KW.
Most engine manufacturers recommend sizing the radiator load bank to
40-60% of engine nameplate rating to
eliminate “wet-stacking” problems.
The K711 load bank is controlled
from a built-in control panel which
contains the individual load-step
toggle switches. The control panel is
also available sized for standard 19"
[482.6] rack mounting when remote
installation of the panel is desired.
power test solutions
Includes Lifting Eyes and Duct
Flange for Easy Installation
The K711 family is intended for use as
a supplemental load for lightly loaded
engine generator sets. The load bank
utilizes the engine cooling air to cool
the resistive load elements.
Legendary Avtron quality combined
with simple operation and maintenance will provide years of trouble
free service.
Avtron’s extensive line of Load Bank
and Industrial Resis­tor Products are
solid performers used throughout
the world.
For total technical support or
additional information, please
contact Avtron at (216) 573-7600
or LBsales@emerson.com.
Model K711 Resistive Load Bank
OUTLINE DRAWING:
SEE DETAIL "B"
K711
K711A
BOLT-ON
DUCT
ADAPTER *
CONTROL PANEL
(STANDARD
LOCATION)
OUTDOOR
LOUVER
(OPTIONAL)
A
B
H=
W=
(RADIATOR
CORE
HEIGHT)
(RADIATOR
CORE
WIDTH)
H + 4.00
[101.60]
H + 4.00
[101.60]
H_ _ _
H_ _ _
DIRECTION OF
ELEMENTS
C
A
C
2.00
REF
[50.80]
W_ _ _
5.50
[139.70]
W + 20.00
[508.00]
POWER
DISTRIBUTION
BLOCK
2.00 REF
[50.80]
1.75
[44.45]
DETAIL "A"
* NOTE:
LIFTING HOLES
1.00 DIA [25.40]
TYP 4 PLACES
0.500 DIA
[12.70]
4 HOLES
1.00
[25.40]
B
5.00
[127.00]
LOAD CONNECTION
BUS BARS
SEE DETAIL "A"
OUTDOOR LOUVER REF
3.75
[95.25]
W=
(RADIATOR
CORE
WIDTH)
SEE DETAIL "A"
13.00
[330.20]
4.00 [101.60]
H=
(RADIATOR
CORE
HEIGHT)
BUS BAR
CONNECTIONS
CONTROL
PANEL
POWER DISTRIBUTION BLOCK
SUPPORT BRACKET
W + 24.00
[609.60]
W_ _ _
CONTROL PANEL
(ALTERNATE
LOCATION)
30°
26.00
[660.40]
K711L
6.00
[152.40]
CONTROL POWER
CONNECTIONS
1.00
[25.40]
AIRFLOW
DETAIL "B"
RECOMMENDED
CONDUIT
ENTRY AREA
DUCT ADAPTER
FLANGE REF
W_ _ _ REF
5.50 [139.70]
7.50
[190.50]
0.62 [15.75]
0.563 DIA
[14.30]
8 HOLES
2.00
[50.80]
1.75
[44.45]
2.00 TYP
[50.80]
IF DUCT ADAPTER IS USED, MOUNT USING LEFT & RIGHT FLANGES ONLY.
OTHERWISE USE TOP AND BOTTOM FLANGES OF THE LOAD BANK.
LOAD CONNECTION
BUS BAR
13.00
[330.20]
C
RADIATOR
42.00
[1066.80]
(CUSTOMER SUPPLIED)
AIRFLOW
12.13 [308.10]
(SCALE 2:1)
4.00
[101.60]
SPECIFICATIONS:
CONSTRUCTION: Formed aluminized steel frame provides
a rigid enclosure to match the height and width of the
engine radiator or duct. Lifting eyes and a radiator duct
flange are included to simplify installation. The standard
K711 depth is 13" [330.2]. For applications where the
amount of load element KW required exceeds the available 13" depth, then a “double-deep” K711A can be used
instead, with a 26" [660.4] depth. Designed for NEMA-1
indoor installation, the K711/K711A is also available in
NEMA-3R outdoor construction as an option. The K711L
frame can be used for special mounting of 1000 KW load
banks to high capacity 2000/2500 KW generator sets.
CONTROL POWER: The K711/K711A/K711L requires exter­
nal control power of 120 VAC, single phase, 50/60 Hz. A
control power transformer is available as an option for
sites where 120 VAC is not readily available.
COOLING: The K711/K711A/K711L does not have its own
cooling system. Instead, it relies on cooling air from the
engine driven radiator fan or separately powered duct
blowers. A built-in thermal switch drops all load if an
overtemperature condition is detected.
CONTROLS: The local control panel contains a POWER
ON-OFF switch, a MASTER LOAD ON-OFF switch, and
individual load step toggle switches for application of
individual load sections. A MANUAL/AUTO switch is also
provided (if the optional automatic load step controller is
included). A remote rack-mounted control panel with wallmounted enclosure is available as an option.
RESISTOR ELEMENTS: The fully supported Avtron
Helidyne™ resistive load elements are made of corrosion
resistant chromium alloy wire and are engineered to
operate at conservative temperature ratings. This provides
more stable loading, extends resistance element operating
life, and eliminates the need for a cool down period after
load bank operation.
OPTIONS:
•
•
•
•
•
•
Control Power Transformer
Outdoor Construction with Bolt-on Louver Assembly
Automatic Load Step Controller
ADMS™ Digital Metering System, Remote Mounted
Remote Control Panel with Enclosure
Designs for International 50/60 Hz Voltages are also available
ADMS™ and Helidyne™ are trademarks of Avtron LoadBank, Inc.
All dimensions are in inches [millimeters]. Specifications subject to change without notice.
Quality System Certified to ISO 9001
6255 Halle Drive • Cleveland, Ohio, U.S.A. 44125-4615 • 216.573.7600 • FAX 216.573.5953
www.avtronloadbank.com • LBsales@emerson.com Bulletin 263A • Rev. H